Yes the RVI Brake 2 Braking System
is compatable with the Sonic. It does requires a back stop plate which is included with the system free of charge. You can use the TPMS in the Sonic when not towing by putting the wireless monitor in Sonic's 12v power accessory port. If you will not be using the TPMS system when driving the Sonic then it is recommended to remove the valve sensors to prolong battery life.